Pulverizer beater



Feb. z3 1926.

S. C. MARTIN PULVRIZER ,BEATER Filed June 1, 1922 Patented Feb. 23, 1926'. Y

UNITED STATES PATENT OFFICE.

STANTON C. MARTIN, OF ERIE, PENNSYLVANIA, ASSIGNOR, BY MESNE ASSIGNMENTS, TO ERIE CITY IRON WORKS, A. CORPORATION 0F PENNSYLVANIA.

/ l `PULVERIZER. BEATER.

Application filed June 1,

To all whom t may concern.'

Be it known that I, STANTON C. MARTIN,

a. citizenof the United States, residing at Erie, in the county of Erie andState of Pennsylvania, have invented new anduseful coal for immediate consumption in furnaces.

With such pulverizers the coal is pulverized and the fuel carried through the pulverizer with the air for combustion.

These pulverizers rotate at a very high speed so that great strength is required., At the same time it is desirable to have the construction as light as possible. Further it is also desirable to have the beater blades carried by the device removable so that they may be renewed as they wear. With the present invention the carrier for the blades is built up of steel as distinguished from a cast structure and the blades are'lightened and simplied in structure.

y The invention is illustrated in the accompanying drawings as follows Fig. l shows a central vertical section through the beater.

Fig. 2 an end view, partly in section.

Fig. 3 a plan view of a beater blade and securing bar.v

Fig. 4 a side elevation of a beater blade.

Fig. 5 an enlarged section of a beater blade and a portion of the support.

Fig. G a plan view of blades having tapered bases.

flanges 6 by means of rivets 9. These T y bars form undercut grooves 10. Beater blades 11 have the bases 12 with the extensions 13 engaging the undercut port-ions of the grooves. The blades, therefore, are positively secured holding them against the strains to which they are subjected by rea- 1922. `Serial No. 565,060.

son of the impact of the material and the centrifugal 'force due to rotation. The blad-es are held in the grooves by plates 14 at the ends of the grooves.

Due to the very high rotation the bars are not ordinarily strong enough to sustain the force where theyare secured only at their ends. I have improved this by supplying rings 15 which have the tapered anges and to which the bars -are secured by rivets 16.

.As many of these rings may be supplied as 1s necessary to sustain the force. They are formed in an ordinary Hanging machine and being of wrought metal, or steel have a great tensile strength.

In order to readily fit the blades which are in the form of castings I prefer to have the bottom surfaces of the bases tapered from a line 17 intermediate the edges. This reduces the amount of grinding necessary to fit the blades for the grooves and inasmuch as when they are vin action the entire force is outwardly against the undercut portions the line 17 forms an ample base.

In o-rder to reduce the weight I provide the depressions 18 at the rear of the blades. The dbars may be tapered or the blades tapere In Fig. 5 the base is of slightly different conformation from that shown in the other igdures, the tapered underface being omitte t What I claim as new is 1. In a pulverizer beater, the combination of a carrier having undercut grooves in its periphery; and beater 4blades having bases arranged in said grooves with portions extending under the undercut portions of said grooves and the under sides of thc bases being bevelled from a longitudinal line intermediate their edges.

2. In a pulverizer beater, the combination of a rotary carrier having undercut grooves in its periphery; and beater blades arranged in said grooves, said beater blades having depressions in their rear` faces reducing the centrifugal strain incident to the rotation of the blades. v

3. In a pulverizer beater, the combination of a hub comprising supporting flanged discs on the hub; T bars secured to the flanged discs, said T bars having their central extensions radially disposed and their carrier; sectional beater blades arranged in grooves in the periphery of the carrier; secthe grooves; and means for locking said tional beater blades arranged in the grooves; blades in the grooves. and a supporting flanged ring intermediate 10 4. In a pulverizer beater, the combination the discs to which the T bars are secured. 5 of a hub comprising supporting flanged In testimony whereof I have hereunto set discs on the hub; T bars secured to the my hand. flanged discs, said T bars forming undercut STANTON C. MARTIN. 

